In this paper, the physical layer side information is employed to improve the throughput of the hybrid-I1 ARQ protocol in the binary phase shift keying wireless communication system. With the combination of the hybrid-I1 ARQ and the n-bit-marked error correction scheme, the packet throughput is improved significantly. The numerical examples show that the throughput of this combination scheme may have a maximum gain about 0.26. I. INTRODUTION Wireless communications possess the convenient

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... y property, which is very desirable. However, the air link, which may be effected by noise, multi-path fading, Doppler frequency shift, introduces significant errors in a mobile computing system. The conventional automatic-repeat-request (ARQ) protocol, which is designed for the wired transmission environment, can effectively control errors for the higher layers. Because of the high error rate for air link, the ARQ protocol becomes not very effective as it used in the wired transmission environment [ 13. The forward-error-correction (FEC) scheme is a well-known method to control errors. Directly applying FEC scheme and the ARQ protocol on a mobile computing system can reduce errors at the expenses of transmission bandwidth, because a packet with FEC has a lot of redundant bits [2]. When the bit error rate (BER) is not so high, say lo4, this direct combination of ARQ and FEC wastes